4. an atom of potassium-39
a cannot have any other isotopes.
contains 39 electrons.
© contains a total of 39 neutrons and
protons.
0 has an atomic number of 39.

49 ! how are energy cycles and growth cycles related?

Discuss how the research in this article shows how new technology and experimental methods can lead to changes in theories. what information did you include in your answer? check all that apply.

Malaria is caused by which type of microorganism? a. fungi b. bacteria c. protozoa d. worms